I don't know what Jeep is doing right with brakes, but I recently replaced my rear brakes for the first time, and it was after 150,000kms and five years of driving it in all weather conditions and terrains. You would think mine would wear out faster with all of the salt, sand, mud etc they have been exposed to, and the heavy mileage I tend to do, but there you have it.
Say what you will about Jeeps, they at least do brakes remarkably well! Coincidentally I also replaced my ball joints for the first time at around 150,000kms as well.
Def